diff --git a/types/moonjs/index.d.ts b/types/moonjs/index.d.ts
index 1194b04d7b..aea32c4de2 100644
--- a/types/moonjs/index.d.ts
+++ b/types/moonjs/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/KingPixil/moon
 // Definitions by: Daniel Rosenwasser <https://github.com/DanielRosenwasser>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 declare namespace Moon {
     export interface Moon<Data> {